1
AIPMT 2005
+4
-1
An electron moves in a circular orbit with a uniform speed v. It producess a magnetic field B at the centre of the circle. The radius of the circle is proportional to
A
$$\sqrt {B/v}$$
B
$$B/v$$
C
$$\sqrt {v/B}$$
D
$$v/B$$
2
AIPMT 2005
+4
-1
A very long straight wire carries a current $$I$$. At the instant when a charge +Q at point P has velocity $$\overrightarrow v$$, as shown, the force on the charge is

A
along Oy
B
opposite to Oy
C
along Ox
D
opposite to Ox
3
AIPMT 2004
+4
-1
A galvanometer of 50 ohm resistance has 25 divisions. A current of 4 $$\times$$ 10$$-$$4 ampere gives a deflection of one division. To convert this galvanometer into a voltmeter having a range of 25 volts, it should be connected with a resistance of
A
$$2500\,\Omega$$ as a shunt
B
2450 $$\Omega$$ as a shunt
C
2550 $$\Omega$$ in series
D
2450 $$\Omega$$ in series
4
AIPMT 2004
+4
-1
To convert a galvanometer into a voltmeter one should connect a
A
high resistance in series with galvanometer
B
low resistance in series with galvanometer
C
high resistance in parallel wilh galvanometer
D
low resistance in parallel with galvanometer.
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